Apparatus for molding hollow articles with recess in inner wall

Claim 1

AN INJECTION MOLDING APPARATUS FOR FORMING HOLLOW ARTICLES HAVING AN INWARDLY OPENING RECESS IN A SIDE WALL COMPRISING A PAIR OF SEPARABLE MOLD SECTIONS AND A COMPOSITE CORE MEMBER INCLUDING A PRIMARY AND A SECONDARY CORE DEFINING WITH SAID MOLD SECTIONS IN THE CLOSED POSITION OF THE LATTER A CAVITY OF THE SHAPE OF THE DESIRED ARTICLE, ONE OF SAID MOLD SECTIONS ACCOMODATING AND SURROUNDING LATERALLY THE COMPOSITE CORE MEMBER AND DEFINING THEREWITH A CAVITY OF THE SHAPE OF THE SIDE WALL OF THE HOLLOW ARTICLE, THE PRIMARY CORE BEING FIXEDLY MOUNTED ON THE COMPOSITE CORE MEMBER ACCOMMODATING MOLD SECTION, THE SECONDARY CORE HAVING A LATERALLY PROJECTING MOLDING SURFACE FOR FORMING THE SIDE WALL RECESS AND BEING MOUNTED FOR LONGITUDINAL MOVEMENT WITH RESPECT TO THE PRIMARY CORE ON SEPARATION OF SAID MOLD SECTIONS FROM A RETRACTED POSITION WHEREIN THE MOLDED ARTICLE IS LOCKED ON THE COMPOSITE CORE BY THE LATERALLY PROJECTING MOLDING SURFACE OF THE SECONDARY CORE INTO A FORWARD POSITION TO STRIP THE MOLDLED ARTICLE FROM THE PRIMARY CORE AND SUPPORT THE ARTICLE IN FRONT OF THE MOLD SECTION CARRYING THE PRIMARY CORE FOR FACILATATING SEPARATION OF THE ARTICLE FROM THE LATERALLY PROJECTING MOLDING SURFACE OF THE SECONDARY CORE.